Sheet-delivering mechanism.



Wl J. ADAM( SHEET 05m/RING MECHAMSM.

APPLICATION FLED FEB. 11| 93 1,187,456. Iat'entedJune 13, 1916.

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4 SHEETS VSHEET 5- W,1.ADAM

SHEET DELIVERING MECHANISM.

APPUCATION FILED mi. 11, 1915.

WL L ADAM.

SHEET DLWFHNG MECHANISM, APVLICMIDN FILED FB.11,19x'3.

Patented J une 13, 1916.

9 SHEETS-SHEET 7.

im 'an sra'rns PATE Enron WILLIAM .1'. A'AM, OF NORWOOIL/ASSACHUETTS, ASSIGNCR T0 PLIMPTON PRESS, 0F NORVODuMASSACHUSETTS, A CORPORTON 'OF MASSACHUSETTS.

SHEET-DELIVERIN G MECHANISM.

memes.

Specification of Letters Patent. Patent-Qd J une 13, 1916.

Application filed February 17, 1913. Serial No. 742,967.

To all whom t may concern Be it known that I, VVnJJAM J. ADAM, a citizen of the United States, residing at Norwood, in the county of Norfolk and State of Massachusetts, have invented certain new and useful Improvements in Sheet- Delivering Mechanism; and 1 do hereby de- Clare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The invention relates to sheet delivering mechanism for printing presses.

The objects of the invention are to provide novel and improved tmechanism for enabling the sheets to be delivered either side np, as may be found desirable; to provide novel and improved mechanism for intermittently operating the' tapes upon which the sheets are delivered from the impression cylinder and by which they are brought into position to be operated upon by a ily delivery, or to be deposited by the tapes on to the delivery board or table; to provide novel and improved mechanism for controlling the movement of the delivery hoard or table as the sheets accumulate upon it, so that the top of the pile may be main`4 tained nt a snbstantially uniform height; and to otherwise improvethe mechanisms by which the sheets are delivered and properly positionednpon the delivery table.

lll/ith these objects in view the invention comprises the features of construction and combinations of parts hereinafter described v and forth in'fthc claims.

The various features of the invention will be readily understood from an inspection -0f thc accompanying drawings and the following detailed description of the mechanisms illustrated therein.

1n the drawings Figure 1 is a side elevation showing a delivery mechanism embodying the invention in its preferred form, and so much of a print-ing press as is necessary to illustrate the application of the delivery mechanism thereto; Fig. 2 is a diagrammatic view indicating one form of mechanism through which' the delivery table may be lowered; Fig. 3 is a plan view of the parts shown at the left in Fig. 1; Fig. 4 is a side elevation, partly in section, of the mechanism'shown in Fig. 3; Fig. 5 is a detail plan view showing a part n? the. sheet i0gis a diagrammatic view tion of the tapes when the parts are in the Aparts for operating ging mechanism; Fig. 6 is a sectional detail showing a part of the mechanism for op-L erating the joggers; Fig. 7 is a rear elevation of the mechanism shown in Fig.v 3, certain parts being shown in section, and other parts being broken away for the sake of clearness; Fig. 8 `is a detailview showing the devices for coupling the fly-linger shaft to its actuating mechanism; Fig. 9 is a. diagrammatic view indicating the position of certain of the parts when the fly delivery is in action; Fig. l() is a diagrammatic view showing the arrangement of the delivery tapes when the fly delivery is in action; Fig. 1l is a diagrammatic elevation indicating the position of certain of the parts when the ly delivery is inactive and the tape delivery is in operation; Fig. 12

showing the posiposition indicated in Fig. 1].; Fig. 13 is a detail elevation, partly the mechanism for intermittently operating the delivery tape; Fig. 14 is a plan view, partly in section, of the devices shown in Fig. 13, the parts 'being shown in a 'different position; Fig. 1:3is a sectional detail through the axis of the shaft carrying the driven tape carrying rolls; Fig. 16 is a' diagram indicating the arrangement of the the tapes; Fig. 17 is a detail section similar to Fig. 15, showing the parts in a different position; Fig. 18 is a detail of the brake mechanism for the tape ,roll shaft; Fig. 19 is a detail of the slotted disk through which the tape roll shaft is actuated; Fig. 20 is a detail of the brakeoperating devices; Fig. 21 is a plan view showing the preferred form of mechanism for controlling the movement of the delivery table; Fig. 22 is a side elevation of the parts shown in Fig. 21; Fig. 23 is a partial plan view showing the mechanism through which the lowering of the delivery table is controlled from the top of the pile; Fig. 24 is a sectional detail on line 24--24, Fig. 23; F ig. 2 5 is a sec.

by which :the dein section, showing tional elevation on line Q9--29, Fig. 28; and Fig. 30 is a sectional view on line :ao-a0. Fig. as.

In the mechanism illustrated in the drawings, 1 indicates the impression cylinder of Aa two-revolution cylinder printing press, which may be of any usual and well-known construction. The sheets, after being carried around the impression cylinder and receiving the impression from the printing form, are stripped from the cylinder bv the usual strippers 2, and are guided on to the delivery tapes 3 upon which they are held by the upper tapes 4. ln ease the sheets are to be delivered printed side down they are carried b v the tapes into position over the fly-fingers 5, and are delivered by the flyfingers on to a vertically movable delivery board 6. AIf the sheets arel to be delivered printed side up` they are carried by the tapes 3 into position over the delivery board. and are delivered directly on to the board by the tapes. ln order that the sheets may be delivered in either way as may be desired, provision is made for renderingr the fly-fingers and their operatin,fr mechanism inactive when the tapesare operated to deliver the sheets directly on to the delivery board, and to render the mechanism which thuS operates the tapes inactive when the flyfingers are to deliver the sheet. As the sheets pass from between the tapes 3 and hold-down tapes 4. they are`subjectcd to a blast of air from a pipe 4 which extends transversely above the tapes just bevond the rolls which support the rear ends of the tapes 4. The pipe 4 is provided with a ries of perforations which are so located .that the jets of air escaping from the pipe are directed against theI upper surface of the sheet at an inclination in the direction of the feed. The air blast therefore not only tends to hold the sheet down upon the tapes, but also counteracts any tendency of the front edge to curl up` since the Yair blast. as it strikes the top of the sheet, is directed along its upper surface in'the direction of the feed. It also dries the ink tro avoid offset.

The delivery tapes pass over rolls 7 secured to 'a shaft 8 arranged adjacent to the impression cylinder and intermittently driven through mechanism which will be hereinafter flescrihed. From the rolls 7 the upper or sheet supporting runs of the tape lead to a series of rolls 9, thence in a reverse direction to rolls 10, thence in a forward direction to rolls 11` from which they return to the rolls 7. Guide rolls 12 may be arranged to engage the tapes between the rolls 9 and the rolls 10 or 7, and guide-rolls 13 may be arranged to engage the tapes bev tween the rolls 11 and 7,' as illustrated in Figs. 10 and 12. lVhen the sheets are to be "delivered by the fly-fingers the tape supporting rolls remain in the position ,indicated in Fig. 10 during the operation of the press, and act to bring the sheets successively into position over the fiy-ingers by which they are taken from the tapes and delivered on to the delivery board. lVhen the sheets are to be delivered by the tapes directly on tothe delivery board, the tape rolls 9 and 10 are advanced from the position indicated in Fig. 10 to the position indicated in Fig. 12 during the forward travel of the tapes to carry a sheet into position over the delivery board, and then these rolls are returned to the position indicated in Fig. 10, during which return movement the tapes pass from under the sheet and deposit it upon the pile onthe delivery board.

ln order that the tape rolls 9 and 10 may be moved forward and back when it is desired to deliver the sheets printed side up, the rolls 9 are secured upon a shaft 14 mounted in a movable carriage., and the rolls 1() are mounted in a cross-bar 15 connected to' or forming,r a part of the carriage. lu the construction shown, the carriage for the roll shaft 14 comprises two side plates 1G in which the opposite ends of the shaft 1l are journaled. llach side plate is mounted to move on guideways 17, and is provided with rollsI 18 running on the upper edge of the guideway, and with a roll 19 engaging the under side of the guideway.

'lhc bar 15 is connected by rods 20 with the side plates 113, and is supported by rolls )l runnin;r on the flanges of the side bars 21S which form a part of the supportiner frame work. 'lhe side plates 1G of the tape roll carriage are connected by links 21 with the upper ends of arms which are secured to a transverse rock shaft 2G. 'l`he rock shaft 2G is actuated to move the tape roll carriage forward and back at proper intervals duringr the operation of the machine through an arm 27 secured to one end of the rock shaft 20, andconnccted by -a link 2S with a crank arm 29 lnounted on a cam shaft Si() of the printingy press. The crank arm 39 may be clamped to the cam shaft, or the clamping,r means may be loosened so that the arm is loose on the shaft, accordingr to the manner in which the. sheets are to he delivered. lVhen the crank arm is clamped to the cam shaft, thc tape, roller carriage. will be reciproeated to deliver the sheets. lf the fiyalelivery is to be used, the crank arln is unclamped from the shaft, so that the mechanism for reciproeatingbT the tape roller carriage becomes inac tive., and the tape rolls remain in the posi `tion indicated in Fig. l() durinr the operation of the press.

When the mechanism for.reciprocating the tape roll carriage isrendered inactive, the sheets are delivered by the ily-fingers 5 over which they are positioned by the tapes loe "She fixed md turned to bril :above- Ufff :230511 in sit/10u by humping ,f-

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ranged to engage a .roll 64 carried by the lower brake block 55. The disk is also provided with a rigid projection G5 at the end of the spring cam plate for holding the clutch in engagement. The clutch sleeve is moved to disengage the clutch by a cam block (3G secured to the drum 51. The cam carrying disk (i2 is provided with four radial slots 67 adapted to be engaged by two actuating rolls G8 and 69 carried by the drum 5l, and is provided with locking surfaces adapted to cooperate with the surface of the drum 5l in retaining the disk 62 in the position into which it is turned by the engagement of the rolls 68 and 69 with the radial slots G7.

The impression c ylinder makes two revolutions in printing and deliveringr each sheet, and during these two revolutions of the cylinder the rolls 68 and 69 turn the cam disk 62 through a complete revolution. The roll GS is fixed to the drinn 51 in such a position that it will engage and turn the cam disk (52 to engage the tape actuating clutch as the front edge of the sheet is transferred by the strippers Q from the impression cylinder to the tapes. The cam block 66 is so arranged that it will disengage the clutch after the rear edge of the sheet has passed on to the tapes. and the roll 69 is arranged a short distance in advance of the cam block (3G. The roll 69 and the caln block 6G may be adjusted so that the advance movement of the tapes will be arrested when the sheet is brought into proper position above the fly-fingers in case the fly delivery is being used. or when the sheet has been brought into proper position over the delivery table when the reciprocating tape delivery is being used.

Assuming that the tape actuating clutch is disengaged, and that a sheet is about to be transferred to the tapes, the roll 68 engages one of the slots 67 in the cam disk (i2 and turns the disk through a quarter revolution. During this movement of the disk the springcam plate G3 rides against the roll (54 and forces the clutch teeth yieldingly into engagement, and brings the lug (35 into engagement with the roll to retain the clutch in engagement. The tape roll sha tt 14 is now rotated to advance the tapes until the sheet has been transferred, or nearly transferred to the tapes. The roll 39 then engages one of the slots in the cam disk and turns the disk through a second quarter revolution. This movement of the disk disengages the lug' 65 from the roll (i1 so that the clutch is free to he disengaged. 'lhe clutch is then free to be disengaged by the cam block (i6 as it travels past the roll (il. After the clutch is disengaged by the cam disk 64 the tapes remain Stationary until the clutch is again engaged. During the rotation of the impression cylinder,

following the delivery of a sheet, the rolls 68 and 69 turn the cam disk through a. half revolution. bringing it back to initial position, so that the cam G3 will be in position to again engage the clutch when the roll (S8 turns the camdisk during the next sheet delivering revolution of the impression Cylinder.

The delivery board or table t3 upon which the sheets are delivered is carried upon vertically movable heads 71 guided upon vertical side rods 72 and raised or lowered by vertical screws 723 engaging nuts carried by the heads. The raising and lowering screws 73 are connected by bevel gears 74 With side shafts 75 which are in turn connected bv bevel gears 7G with a transverse shaft 77 so that the screws turn in unison to simultaneously raise and lower the heads 71.

The sheets delivered by either the fly or the reciprocating tape delivery are properly positioned upon the deliverytable, or upon the top of'the pile carried by the delivery table. by jogging devices arranged to embrace the upper part of the pile. A As shown` the jogging devices comprise front and rear jogging boards 78 and 79, and side jogging boards 80. The front jogging board 78 is carried by arms 81 which are provided with hubs 82 mounted to slide upon the shafts 75. The rear jogging board is carried by arms 83 adjustably secured on rods S4 which are mounted to slide in bearings 85. The side boards are carried by rods 8G mounted to slide in bearings 87. The supporting reds SJ( and 86 are connected by bell crank levers 8S pivoted upon fixed supports 89 and provided at their ends with slots engaging pins carried by collars 90 which are adjustably secured to the supporting rods. The supporting rods 84 for the rear jogging board are connected with the front jogging board by levers 91 pivoted upon fixed supports 92 and provided with slots in their ends engaging pins carried by lugs 93 and collars 91 on the arms Sland supporting rods 84 respectively. 'lhrough the connections described the jogging boards are moved in unison when they are actuated to jog and position the top of the pile. The jogging boards are yieldingly held in advanced position where they retain the top of the pile in proper position with relation to the delivery board by springs 95 interposed between the hubs of thegears t3 and the hubs 82 of the arms which support the front jogging board 78. 'hen the sheets are being delivered by the tiy-tingers, the jogging devicesware retracted during the delivery -of each sheet by arms 9G secured to the fly-fingerk shaft 31` and provided with rolls 97 at their outer ends adapted to engage and swing the arms 91 during the latter part of the delivery stroke of the liy-fingers. When the sheets are being delivered by reciprocating the tape roller carriage, the arms 91 are operated during the delivery of each sheet to retract the jogging boards by arms 98 secured to the rock shaft 26, and provided with rolls 99 adapted to engage shoulders 100 formed 0n links 101 which are connected with the arms 91. The links 101 are supported and guided by plates 102 which ride on the shaft 26, and are slotted to straddle the arms 98.

The delivery board may be lowered as the pile of sheets accumulate to keep the top of the pile in proper relation to the delivery and jogging devices either manually or automatically. If the delivery mechanism is used in connection with ay machine provided with mechanism for automatically feeding sheets to the press from a vertically movable feed table, the screws 73 may be conveniently actuated to automatically lower the delivery table byl connecting one of the shafts with the mechanism indicated diagrammatically at 10S in Fig. 2 through which the upward movement of the feed table is controlled to maintain the top of the pile on the feed table in proper relation to the sheet separating and feeding devices. lt preferred, however, to provide means for automatically lmvering the delivery table which is controlled from the top of the pile on the delivery table so that the top of the pile is automatically maintained in proper relation to the delivery devices as the sheets accumulate. The preferred form of such mechanism is shown in Figs. 21 to 30. As here shown, one of the shafts 75 is connected through gears 104 with a shaft 105 which is intermittently actuated to turn the screws 73 and thus lower the delivery table. The shaft 105 is actuated at intex-vals through a gear 106 loosely mounted on the shaft, and carrying an annular flange 10T forming,r one member of a clutch, the other member of which is a. sleeve 108 loose on the shaft. During the normal running of the machine the sleeve 108 is connected with the shaft through a gear 145 keyed to slide on the shaft for a. purpose to be explained later, and provided with clutch lugs 146 coperating with clutch lugs 117 on the sleeve. The clutch is a forni of Horton clutch in which the clutch rolls 109 arc interposed between the inner surface of the flange 107 and wedging surfaces 110 formed on thc sleeve 108. The rolls are arranged between the lugs 111 of the roll carrying ring 112 which is connected with the clutch sleeve 108 by a spring 113 tending to turn the ring in a direction to wedge the rolls between the surfaces and the inner surface of thc flange 107. The wedge surfaces 110 are so arranged that the gear 106 may turn idly in one direction when the clutch is engaged, but will be clutched to the shaft to turn the shaft when moving in the opposite di rection. The gear 106 is oscillated during the operation of the press by means of a rack 114 pivoted to the upper end of the reciprocating rod Ll5 and engaging a gear 115 which in turn engages the gear 106. The roll carrying ring 112 of the clutch provided with a tooth 116 arranged to engage a stop 117 carried by a pivoted arm 118. When the stop tooth is in engagement with the stop, the roll. carrying ring is held against rotation, and the clutch is out of engagement or inactivey The stop 11.7 is preferably in the form of a lever pivoted to the arm 118 and connected to the arm by a spring 119 which tends to turn the roll carrying ring in a direction against the tension of the spring 113, so that the rolls are maintained in the inactive part of the sur faces 110, and do not tend to wedge between the surfaces and the flange 107 so long as the engagement with vthe stop on the arm 118. When the stop arm 118 is operate'J to release the roll carrying ring, the clutch is ren dered active, and the shaft 105 is turned through a single revolution, and then the clutch is disengaged by the rengagement of the stop tooth with the stop arm through mechanism controlled from a controller finger 120 which is engaged with the top of the pile after the delivery of each sheet. T he controller finger is secured upon a rock shaft 121 .mounted on one of the side jogging boards 80 and connected by gears 122 with a, rock shaft 123. The gear 122 on the rock shaft 123 is keyed to slide on the shaft as the jogging board is moved forward and back. The rock shaft 123 carries an arm 124 which is provided with a segmental surface 125 arranged to'support a coupling finger 126. The finger 126 is mounted to slide and turn on a pin 127 which passes through a slot in the finger, and the lower end of the finger is held in engage ment with the segmentv 125 by a spring 128 which tends to draw the finger downward. When the finger is supported upon the segment 125 its upper end lies between two Slide bars 129 and 130. I The bar 129i, is ai ranged to engage projection on the stop arm 118, and the bar 130 is rcciprocated at regular intervals during' the operation of the press through a lever 131` the upper end of which is arranged to engage the bar. and the lower end of which carries a roll ai'- ranged in the path of. a cam 132 on the rock shaft The lever is operated by the cam to advance the bar 130 during the delivery of each sheet.

The arm 124 and rock shaft 123 are moved in a direction to engage the controller fnger 120 with the top of the pile through a, spring 133 connected with the'frce end of a link 1341 which is supported upon a fixed pin stop tooth on the ring is in 135 and is connected with the arm 124. The arm 121 is moved in a direction to raise the controller finger from the pile so that the succeeding sheet may be properly positioned on the pile by an arm 136 carried by the shaft 38, and provided with a slot 137 adapted to engage a roll 138 on the link 131. During the delivery of each sheet the arm 152-1 will be moved toward the right in Fig. 27 by the actuating arm 136 on the shaft 38, thus raising the'controller finger from the pile. During the backward stroke of the shaft 38 and arm 136 the arm 124 will be moved toward the left in Fig. 27 by the spring 133 until the controller finger engages the top of the pile, when further movement of the arm will be arrested. The extent of movement of t-he arm 124 toward the left will therefore depend upon the height of the pile, the movement decreasing as the height of the pile increases. So long as the top of the pile is above a predetermined point, therefore, the segment 125 will remain under the coupling finger 126 when the arm 124 completes its movement toward the left. and the upper end of the coupling finger will remain between the slide bars 130 and 12S), so that motion will be transmitted from the bar 130 to the bar 129 when the bar 130 is advanced. and the stop arm 11S will be operated to render the table lowering clutch active. rl`l1e clutch will be rendered active, and the actuating shaft 105 will be given a single revolution during the delivery of each sheet so long as the top of the pile is above a predetermined point. lVhen the intermittent lowering of the delivery table carries the top of the pile below a predetermined point, the movement of the arm 124 toward the left in Fig. 27 will be sullicient to carry the segment 125 from below the lower end of the coupling finger 126, so that the finger will be drawn down by its spring 12S, thus uneoupling or rendering inactive the. mechanism for rendering the clutch active. lVhen this occurs, the slide bar 130 will move idly forward when actuated by the cam 132, and the table lowering clutch will remain inactive. "hen the coupling linger 12o moves downward, its lower erid is brought in front of the segment 125, so that the linger is swung about its pivot as the segment arm 121 is moved toward the right. As the segment arm completes its movement in this direction, the lower end of the coupling finger engages a notch 139 in the segment, so that on the return movement of the segment the coupling finger is swung about its pivot and raised into thel position indicated in Fig. 27, after wlnch 1t rides on the segment 125 during the continued return movement of the segment arm, and either remains in its upper position or drops ofi' theend of the segment. according the height of the pile. Thus through the mechanism described the mechanism for lowering the delivery table is controlled by the controller finger 120, the mechanism being rendered active to lower the pile when the top of the pile is above a predetermined point, and being rendered inactive Whenever the top of the pile is below this point.

In order that the delivery table may be f rapidly raised or lowered when desired, the machine is provided with an electric motor 140, the shaft of which :is connected through reversing gearing 141 with a gear 142 secured to the outer end of the shaft 143, the inner end of which is provided with a gear 144 adapted to mesh with the gear 145 when it is drawn back to disconnect the automatic clutch from the shaft 105. During the normal running, of the machine the gear 115 is forward out of mesh with the gear 141 and with the clutch lugs 1115 and 11T in engagement. 'hen the motor is to be used to raise or lower the delivery table, the gear 1-15 is moved back on the shaft to disengage the clutch lugs and to bring it into mesh with gear 11-1, and thus connect the gear 111 with the shaft 105.

While it is preferred to employ the construction and arrangement of parts shown and described, it will be understood that this construction and arrangement is not esscnextending above the path of the rolls to act as a guide for the tapes, and means for reciprocating the tape supporting rolls or retaining them in fixed position.

2. A sheet delivering mechanislil, having, in combination, a reci}n'ocating delivery, a fly-delivery including a fly-finger rock shaft, arms carrying the rock shaft, an actuator shaft, means for holding the arms with the shafts in line or with the fly-finger shaft in a higher plane, and means for coupling or uncoupling the shafts.

3. sheet delivi-"ing mechanism, having, in combination, a reciprocating tape-delivery including two sets of fixed tape rolls, a tape roll carriage carrying two sets of tape rolls and tapes looped about the fixed and rzovable rolls, mechanism for reciprocating the carriage or retaining it in fixed position, a fly-delivery to which the sheets are presented by the tapes when the carriage is in fixed position, and means for iendering the {1y-delivery active or inactive.

4. A sheet delivering mechanism, having, in combination, a vertically movable sheet receiving table, a tape delivery comprising two series of fixed tape rolls, a'reciprocating roll carriage carrying two sets of tape rolls, and tapes looped over the fixed and movable rolls, mechanism for reciprocating the carriage or retaining it in fixed position, a fiy delivery to which the sheets are presented by the tapes when the carriage is in retracted position, and means for rendering the fly delivery active or inactive.

5. A sheet delivering mechanism, having, in combination, a tape delivery comprising a series of fixed tape rolls 7, a second series of fixed tape rolls 11, a reciprocating roll carriage carrying the tape rolls 9 and 10, tapes looped about the rolls 7, 9, 10 and 11, mechanism for reciprocating the carriage or retaining it in retracted position, a rock shaft 31 carrying fiy fingers and arranged adjacent rolls 9 when in retracted position, means for holding the shaft 31 in fixed position for delivery of sheets to the fiy fingers or in position above the path of the rolls 9, and mechanism for rocking the shaft 31 which may be rendered active or inactive.

6. A sheet delivering mechanism, having, in combination, an impression cylinder, a {1y-delivery, sheet conveying tapes leading from the impression cylinder to the fly delivery of a length to support a plurality of sheets, and mechanism for intermittently advancing the tapes to bring the sheets carried thereby successively to the fiy-delivery.

7. A sheet delivering mechanism, having, in combination, an impression cylinder, tapes to which the sheets are delivered, a

series of tape supporting rolls mounted in fixed position ad]acent to the cylinder, tape y actuating mechanism including a clutch, mechanism foi` engaging the clutch during the delivery of the sheets to the tapes and for disengaging the clutch after each sheet has passed on to the tapes.

8. A sheet delivering mechanism, having, in combination, an impression cylinder, tapes to which the sheets are delivered, tape actuating mechanism including a clutch, a cam disk for engaging the clutch provided with radial slots, projections connected to move with the impression cylinder for successively engaging the slots, and a cam connected to move with the impression cylinder for disengaging the clutch.

9. A sheet delivering mechanism, having, in combination, an impression cylinder, tapes to which the sheets are delivered, a shaft adjacent the impression cylinder carrying tape supporting rolls, a gear connected to move with the impression cylinder, a clutch member on the shaft driven from said gear, a cooperating clutch member connected to rotate with the shaft, atdrum connected to rotate with the impression cylinder, a disk loosely mounted on the shaft and provided with a camfor engaging the clutch members and with four radial slots and intermediate locking segments, two rolls carried by the drum for successively engaging the slots in the disk, and a cam block carried by the drum for disengaging the clutch members.

WILLIAM J. ADAM.

Witnesses E. STANLEY SMITH, JANE C. VViLLiAMs. 

